Draw-bench.



G. W. FROHUCH.

DRAW BENCH.

APPLICAUUN FILED FEB. 16. l9l5.

1,172,448, Patented Feb. 1916.

4 SHEETS-SHEET l.

y r s G. W. FROHLICH DRAW BENCH. APPLICATION FIL-ED FEB. I6. |915. 1,172,448. Petented Feb. 22,1916.

4 SHEETS-SHEET 2.

x 71h m2: 5505. MMM

www@

G. W. FROHLICH.

DRAW BENCH.

APPLICATION man FEB.16,|9\5.

Patented Feb. 22, 1916.

4 SHEETSSHEET 3.

lim/Calo?? n Y Q GEORGE Ilf Emi/H01L G. W. FROHLICH.

DRAW BENCH.

APPLICATION FILED FEB. 16, |915.

1,172,448. Patented Feb. 22,1916.

4 SHEETS- SHEET 4.

I'IG. 9.

INVENTOR.'

WITNESSES:

GEORGE' m0551015 By U l f f 7&4?

W v ATTORNEYS.

GEORGE W. FROHLICH, 0F CHICAGO, ILLINOIS.

DRAW-BENCH.

Specification of Letters P atent. Patented Feb. 22, 1916.

Application 1aed rebruary i6. 1915. serial No. 8,450.

To aZ whomI it may Concern:

Be it known that I. (leonor. lV. FiioiiLic-H, a citizen of the United States, and a resident of the city 'of Chicago. in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Dra w-Benches ,andI do hereby declare that thefollowing description of my said invention, taken inA connection with the accompanying sheets of drawings, forms a full, clear. and exact specification. which will enable others skilled in the arts to which my said invention appertains or with which it is most nearly connected to make and use the same.

This invention has general reference-to draw-benches, and i'noie particularly to that class of draw-benches which are. now employed for drawing, from strip-sheet metal. formed bars, such as bars for 'sheet metal doors. window casings, window' sashes, bars for sky-'lights and analogous work: and it has for its object the construction of such a' machine in which a multiplicity of drawing instrumentalities a-i-e combined in a single structure. and in which the gripping tongs or nippers. by which the strips are being pulled on each of the several instrumentalities are autoinaticalliY released when they reach the end or terminal of the structure, and are then automatically returned to a single receptacle at. the initial. or starting point of the machine. To accomplish these results. I construct this' machine in its preferred embodiment. as shown inI thc drawings already mentioned. in which- Figure 1. is a plan of this improved drawbeiicli. Fig. 2. is a plan of a fragment of the endless drawing belt and one of the gripping nippeis.- Fig. 3'. is a side-elevation of the mechanism illustrated in Fig. 2. Fig. l. is a perspective view of the means employed for disconnecting the gripping nippers from the endless drawing belt. Fig. C, is au cndview of the complete machine a portion of the eonveyii'ig troughs being shown in Asection. Fig. G. is a side-elevation of the complete machine. Fig. i'. is a sectional view o a portion of the machine taken online bei of Fig. 5. Fig. S. is a transverse sectional view taken on line S-S of (i. Fig. 9; is a sectional elevation of a fragment of the machine looking toward the forward end, on line 9-9 of Fig. 10. yand showing. one. of the. gripping tongsI in the act of being disengagedfroin the endless chain belt ready to drop by gravity into the chute througha which it passes to reach the conveye'r belt which returns this gripping tong to the starting end of the machine. .Fig 10, is a sectional plan view on line 10-10, of Fig. 5, of the rear portion of the. machine, the endless chain belts, and the conveyer belt being omitted, and also'showing a modified form of driving mechanism for these endless i belts.

Vdrawings I have, therefore, shown the inaching` broken, to indicate that the length thereof maybe varied to accommodate varying conditions. ,'AS shown in Fig. -1. this machine includes a multiplicity of like drawingdevices arranged side-bylside in parallel spaced relation, there being in the preferred arrangement and constructionfour of these strip-drawing devices, two on each side of a ceiitially..disposed conveying mechanism by which the gripping tongs of the ent-ire series of drawing devices are returned to a receiving receptacle common to all the drawing devices. As arranged, the two strip-drawing devices at oneside of the central. gi'ippiiig-tongs-returning inecha nisiu. are elevated. at their rear ends, above those of the opposing set of drawing meehanisms. as will hereinafter more fully aplill'.

B. in the drawings designate two of the draw-henchcs located at the left side of the machine. and as well. those on the. right side thereof. These bencl'ies. Vexcept where otherwise stated are alike and a description of one of these 'drawing-devices will therefore. equally apply to, all the others.

That portion or section ofthe machine carrying the drawing devices A. B. includes, as best shown in Fig. S, two pairs of .sidewalls. S. fl. and l0. 11. respectively, the pairs of side walls being in parallel spaced relation. with a wider space betwcenthcr walls 10, and l1. as will be hereinafter referred to. The, side-wall 8 is secured, at its upper inargin. to a longitudinal rail 14, while the sidewall 9 is similarly secured to a longitudinal rail 15, both rails extending the entire length of the machine; and they are supported upon suitable supports or legs 16, 17, properly braced by struts 18, wherever necessary or desirable. The members 8,10, and 11, 9,

are connected to each other adjacent to their upper margins by; longitudinal floors or running-boards, 19, 20, respectively, while the inner side-walls 10, 11, are connected at.

, shafts 27, 28, rotating in bearings 29, 30, se-

cured to the forward supports 16, 1T.

At the rear end of the machine there is, transversely located, a shaft 31, F igs". 1, 5, 6, and 7, rotating in suitable bearings, 80, and carrying, in alinement with the two endless draw-chains 23, 24, two sprocket wheels, 32, over which the two endless chain belts 23, 24, are also trained and by which these belts are driven. At therear end of the frame structure on which the endless chain belts are mounted,there,is a downwardly directed chute, 34, which leads from 'the left hand side of the frame Structure to a central channel 35, which channel comprises two side-wals 36, 37, secured to the opposing supporting members 17, 17, and a bottom or runway, 38. 'At'the forward endA of the frame structure there is journaled an idler wheel, 39, Fig. 6, and at the rear end of said frame structure there is mounted la driving sprocket 40, secured to a shaft, 41, having bearings in a housing 42. On this shaft 41l there is, furthermore, mounted a .driven pulley 43, to which rotative motion. 1s communicated by'a, belt 44, as will hereinafter more fully appear; Over thisY driving sprocket 40 and the idler wheel 39 there 1s ltrained an endless linkconveyer'belt `45,V

which carries at intervals cross-barsor paddles, 46, the 'object of which I shall now describe.

Figs. 2 and 3 show, on an increased scale a'pa'ir o'f toggle-jointedgripping tongs E, the two pivotally connected members 47, 48, `of which, are link-connectedv by members 49, 50, which at adjacent terminals are pivoted to a bar 51, which has a downwardly extending hook 52, constructed to engage any one of the cross-members 53, of the link-belt 23. The members 51, and 47 of the gripping tongs E are preferably provided with knobs or handlebars, 54, for convenience in handling the same. Y

As stated in the preamble to this specifidrawing devices.

ation ofthe same.` y y.

The OPQITa-OD 0f` the-,-devices-heretofore' cation, the two sets of elements of this mawardly leading channel or chute '56, above the lower terminal of the chute 34 leading from the left side strip-drawingv instrumentalities A, B, to said central channel 35. By thus conducting the gripping tongs from one set'of strip-drawing devices to the return conveyer belt, above, and in advance of those coming-from the, other set of. striptwo gripping tongs E cannot drop upon said conveyerbelt at the-same place, although two of said gripping tongs E may fall thereon at thesa'me time, which, were there more than one pair of gripping tongs E dropping on the :zonveyer belt at the same time and thel same place, might cause them to wedge themselves in the conveying channel 35,A and thereby result in breakage and possible damage to, and interruption of the operation of the moving parts.A This is a very desirable and important feature of this machine, contributing 'as it does, its-.share toward the successful and A economical operdescribed 1s, essentially, as follows: At the' forward end of the machiiieftherere providedA suitablemeans gfFigs. 1, and .6, t'o receive a roll of slitted',s` li et metal..the end of 'which is led upwardly'ove'r a guiding'roller 58, lmounted in suitable bearings 59, and thence passed through one or'more shaping vdies 60. A pair of'gripping tongs E is now hitched to the end of sheet metal strip or ribbon 61, and these nippers, bythe hook 52 thereonattac'hed to the proper endless I derive the result that i chain belt 23,'i`t being understood that thef Y upper stretches of all 'these said belts travel toward the rear end of the structure andthus pull a length of formed sheet metal bars, almost as long as the entire structure.

Near the rear end of vtheestructune," and located on the upper marginale ofthe sidewalls 8, 9, there are located inclined planes 62, one of which is shown in detail in Fig. 4; and near their rear ends, the longitudinal members '10, 11, 'have their inner upper margins beveled or chamfered as illustrated at 63, whereby, when a pair of gripping tongs approaches the rear end of the structure, one side of the lsaid gripping tongs will move upwardly on said incline 62 and thereby be tilted, thus disengaging the hook 52 from the endless chain, and slide downwardly, by gravity, over'the chaxnferedr edge 63 into the chute 34, or the chute 55, as the case may be, and then drop on the upper stretch of the conveyer belt 45. which moves toward the forward end of the structure, and where one of the cross-bars 46 thereon will engage the gripping tongs and push the same forward until the forward end of the structure is reached where said gripping tongs will drop into a receiver 64, occupy- .ing the forward terminal of the chalmel 'lhc shafts 31. by which the endless chain belts are operated. carry at their outer terminals pulleys. G5, G6; and above the rear end of the machinery there is located a counter shaft, 67, rotating in hangers 68, 69, which counter shaft receives` rot-ary motion from any suitable prime motor, not shown. Near the terminals of this counter shaft there are mounted pulleys. 70, 71. over which, and the pulleys 65. 66, belts 72. 73 are trained to communicate rotary motion to said shafts l31. Upon counter shaft 6T is mounted a further pulley 74; and on a counter shaft 75, rotating in suitable hangers 76, is mounted a driven pulley TT. over which, and the pulley T4, a belt 78 is trained to communicate rotary movement to said counter shaft 75. Upon this latter counter shaft there is also mounted a driving pulley T9. by which. and the belt i4 already referred to. rotary movement is transmitted to the shaft 41. all as clearly illustrated in Figs. 5, and 6.

Attention is now directed to the fact that in the structure as described. a series of strip-drawing devices are simultaneously operated. and that a single o erator is capaiic ot' readily attendine: to tie entire series ol these devices to keep them supplied with strip-metal. and that all the grippin tongs or nippers from the entire series o striptlrawing devices are automatically returned to a single receiver. within easy reach of said operator. the result being that long bars of shaped sheet metal may be formed on this machine. the cost for labor of which is nominal. The long strips are collected in the troughs C. D. and the farther ends of these troughs may be left open so that the long bars may be withdrawn therefrom. to be cui to shorter lengths by suitable machinery not shown. located adjacent to the rear end of the structure. .\s shown the shaft 81 is directly driven by the comparatively Ilarge -lriving pulley 65. but this construction may be modified. as shown at the right of Fig. 10. by .substituting for the driving pulley. a .spur gear wheel. Sl. wherewith meshes a gear pinion S2. mounted on a shaft SS. together with a `smaller driving pulley Qi. which will be roi ated from the counter shaft 6T. in the same manner as the larger pul ley o5. in an obvious manner.

it will now be understood that whenthe gripping tongs reach and move on the iu- Cline 62, the connection with the endless chain belt will be severed and the jaws oi these tongs will open automaticallyv and disn connect from the drawn and shaped bar ot stri sheet metal, which bar will then be cut olf ehind, or in rear of the drawing dies. and another pair of gripping tongs applied to that portion of said strip adjacent to said drawing dies. and then the cycle of operations repeated as often as bars are to be produced, in the same dies. These dies are removable and others may be substituted therefor in a manner now common in bar drawing devices. The object of dividing the space between two sets of bar drawing devices by thc partition 22. is to afford a sepav rate trough for each bar drawing instrumen` tality which is desirable when one instrumentality draws a bar. diti`erent in contoni from the other. to prevent the bars being mixed. but it is evident that this partition may be dispensed with. if desired, withftlt seriously impairing the usefulness of this machine. And in order that. this machine may comply with the laws of the various States for the protection of workmen fron:- injury by moving parts. I surround the pulleys (i5. titi.' with suitable asings 85, S6, as clearly shown in Figs. 1. 5. ando.

Alttention is now directed to the fact that. in drawing heavy material. the travel oi" the gripping tongs li. up the incline plane (i2 is often insutlicient to release the hook 5:2. from engagement with the endless chain. by reason oi the pressure of contact ol' said hook 5:?. against said endless cbain linh 32E. Thus. in order to insure a positive release of this hook 52 at the proper time. il naat be added that the sprocket 3; or S11." is .so located. that as the particular tooth thewot'. when it enters into the link against with? the hook 5:2 inipinges` will Force said hooi. 52 upwardly to a full release at the proie time in an obvious manner.

I have heretofore described with consid erahle minuteness the preferred entita? ment of my invention. and the best meth-i of carrving the same into eiieet: but l dem it to be understood that many of ti i. tails may be varied. it' desired. without la parting from the scope ot' my invention a defined in the appended claims.

Having thus fully described my inven tion I claim as new and desire to secure to myself by Letters latcnt of thc inited States l. machine for drawing shaped bars sheet metal from stripped stock. inclini a series of sets oi" drawing instrnnicntalit n one set of such instrumentalities being,r in a substantially horizontal plane. the other set: being.r rearwardly and upwardly inclined. separate Chutes leadingr from each sift. of drawing instrumentalities downwardly amt toward each other, the terminal of one of said chutes overlying the terminal of the other of said chutes and ending in front of the end of the latter chute, a channel between adjacent sets of said instrumentalities into which the aforesaid chutes lead, an endless conveyer-belt in said channel, a receptacle at the forward end of said channel, means for operating the drawing instrumentalities, and means for operating said endless conveyer-belt.

2. In a machine for drawing shaped bars of sheet metal from stripped stock, the combination, of a suitable frame structure, an endless chain-belt movably located in said frame structure, means, for drawing said stripped stock along said frame structure, by said endless chain-belt, including a pair of gripping tongs, constructed for removable connection with said endless chain, means adjacent the rear end of said frame structure eonstructedto disengage said gripping tongs, a chute adjacent the rear end of said vframe structure, an endless -conveyerbelt in said frame structure, said 'conveyerbelt moving in a direction opposed. to that of said endless chain-belt, said chute terminating above, and in aXial line with, said endless conveyer-belt, a receptacle at the forward end ,of said frame structure, said receptacle being in communication with said endless conveyer-belt, and means for operating said endless chain-belt and the endless conveyer-belt. i

3. In a machine of the nature described, a pair of formed bar drawing'instrumentalities, including, in combination, a suitable frame structure, a pair of channels in said frame structure in parallel spaced relation, an endless-chain-belt in each of sai'd*V of said channel, said inclined plane beingk channels, a trough between said channels constructed to receive the, formed bars, a chute at the ends of said channels, a further channel adjacent to the heretofore mentioned two channels, said' chute terminating in thelatter channel, an endless-conveyerbelt in the latter channel, gripping tongs, said gripping tongs being provided with means for removable attachment to said endless-chain-belts, an inclined plane at the rear end of each of the pair of channels constructedto tilt said gripping tongs to disconnect said gripping Atongs from said endless-chain-belts to drop through said chute onto the endless-conveyei-belt by gravity, and means for operating the two endiess-ehain-belts and the endless conveyen (:ilh i 4. A machine for drawing shaped bars from ribbon sheet metal, comprising, a multiplicity of sets of strip drawing mechanlsms, each set of such mechanisms including an endless chain-belt, means constructed to operate the endless chain-belts in each set simultaneously, gripping tongs for each mechanism in each se't, said gripping tongs being provided with means for detachable connection with said endless chain-belts, means on each individual strip drawing mechanism constructed to tilt said gripping tongs to disconnect them from said endless chain-belts, a channel common to all of the sets of strip drawing mechanisms, an end'- less' conveyer-belt in said channel, a chute, leading from one set of said strip drawing mechanisms to said endless conveyerbelt, a further chute leading from the second set of strip drawing mechanisms to said endless conveyer-belt, said latter chute terminating in advance of the terminal of said first mentioned chute, and means for operatnrg the endless conveyer-belt in the opposite irection from that in which the entire series of endless chain-belts are moving.

5. In a machine for drawing shaped bars from ribbon sheet metal, the combination of a suitable frame structure said frame structure including, two longitudinal walls in parallel spacedw relation said wallsA being connected at their lower margins by a transverse bottom to afford a channel, an endd less chain-belt, the upper stretch` of said chain-belt being constructed to move rearwardly in said channel, a drawing die at the forward terminal of said channel, an inclined plane adjacent the farther terminal located at the upper margin of one of said walls, the upper outer margin of the opposing wall being chamfered, a further channel adjacent the latter wall, an endless conveyer-belt in the latter channel, a chute connecting the two aforementioned channels, Said chute terminating above the upper stretch of said endless conveyor-belt, and means for operating the said endless chain-belt and the said endless conveyer-belt.

In testimony that I claim the forv`r ing as my invention, I have hereunto set my ha "1d in the presence of ltwo subscribing witnesses.

GEORGE W. FROHLICH. ln the presence of- C. S. STARK, lV. HARDING. 

